SU972477A1 - Device for voltage tolerance checking - Google Patents

Description

The invention relates to automation and measurement technology and can be used in electrical signal control systems.

A device for monitoring and indicating the levels of logic signals is known, comprising a generator, a logic unit and a comparison unit, which allows to control the limits of logic signals in a static mode.

The disadvantage of the device is limited functionality due to the lack of control in the dyngagic mode.

The closest technical solution is a device for indicating faults of monitored objects, containing AND display channels, comparison circuits, AND-NOT elements, an indication element, and a source of reference levels common to all AND channels, and a pulse generator, with the input V of the indication channels connected to one circuit inputs

comparison, other inputs of the comparison circuits are connected to the source outputs of the reference-j Hbix levels, the output of the first comparison circuit is connected to the first input of one AND-NE element, the second input of which is connected to a pulse generator, and the output of the first AND-NOT element is connected to the first input of another element AND-NOT, the second input of which is connected to the output of the first comparison circuit, the output of the second element AND-NOT is connected to the input of the display element G21.

The drawbacks of the device are the inability to control the boundaries of the signal of an arbitrary level and the need to have as many indication channels as there are objects to be monitored, which leads to low confidence of the control.

The purpose of the invention is to increase the reliability of the control.

The goal is achieved by the fact that the device for tolerance control, including the sensor unit, the source of voltage reference levels, the first output of which is connected to the first input of the tolerance control unit, connected to the information input of the indicator and the first input of the NAND element, the second the input of which is connected to the output of the pulse generator, additionally contains two switches, a decoder, an adder, and a counter, the output of the sensor unit and the second output of the source of reference levels, for example, the SRI are connected via The main commutators with the input of the adder, the output of which is connected to the second input of the tolerance control unit, and the control inputs of the switches are connected via a decoder to the control input of the indicator and the output of the counter, whose input is connected to the output of the NAND element. The drawing shows a block diagram of devices for tolerance control of voltages. The device contains a sensor unit 1 including input rails 2 and a first node of weight resistors 3, a source 4 reference voltage levels, including a block of 5 standards and a second block 6 of weight resistors, switches 7 and 8, a decoder 9, an adder 1O, a block 11 tolerance control , element I-NOT 12, generator 13 pulses, indicator 14, including the display control unit 15 and the board 16, counter 17. The device operates as follows. Electrical signals, both positive and negative, are received from controlled objects using incoming signals. nga 2, block 3, where they are masschtabirova s. From block 3, the normalized signals enter the switch 7, where, in the order of priority determined by the decoder 9, one of the signals commutes to the input of the adder 10. At the same time, the input from the switch 8, the signal from the switch 8, is equal in value to the monitored but opposite polarity . This signal is formed 5a in block 6, where the voltage of the corresponding polarity comes from block 5, In the adder Yu there is an algebraic addition of both

signal amplification of their sum which

enters block 11, where also the post-5S chl. 327-73, published. 1978

give reference signals from source 4, / 2. USSR author's certificate

that set the permissible boundaries № 562823, cl. 006 F 11 / GS, 1975

monitored signals. (prototype).

Claims (1)

taken into account in the examination 1. US patent No. 3833853, If the monitored signals have the same level, block 11 is performed according to a scheme containing two comparators and the element OR-IIE. If the monitored signals have AND levels, the circuit of the tolerance control unit contains 2 AND comparators, C of the OR elements and the NAND element with and inputs. When the value of the monitored signal does not correspond to the specified limits, a logical zero signal appears at the output of block 11 and the pulses go to counter 17 through the H-NO 12 element. Counter 17 stops, block 15 issues the corresponding code on the display 16, where the number of the monitored signal is displayed which level does not correspond to the established limits. The use of a device for tolerance control of voltages allows control of the magnitude of electrical signals of an arbitrary level, both positive and negative. The invention claims a device for tolerance testing of voltages containing a sensor unit, a source of reference voltage levels, the first output of which is connected to the first input of the tolerance monitoring unit connected to the information input of the indicator and the first input of the NAND element, the second input of which Connected to a pulse generator output, characterized in that. In order to increase the reliability of the control, it contains two switches, a decimator, an adder and a counter, the output of the sensor unit and the second output of the source of reference levels, voltages are connected through corresponding switches to the input of the adder, the output of which is connected to the second input of the tolerance control unit, and control inputs Commutators are connected via a descrambler to the control input of the switch, the control input of the indicator and the output of the counter, the input of which is connected to the output of the NAND element. Source information.